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| <title>memory_order</title> |
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| <h1>memory_order</h1> |
| <p> |
| Enumeration to identify memory ordering constraints. |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="synopsis"></a> |
| <h3> |
| </h3> |
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| memory_order |
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| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| The OpenCL C programming language implements a subset of the C11 atomics (refer to section |
| 7.17 of the C11 specification) and synchronization operations. These operations play a special |
| role in making assignments in one work-item visible to another. |
| A synchronization operation on |
| one or more memory locations is either an acquire operation, a release operation, or both an |
| acquire and release operation. (The C11 consume operation is not supported.) |
| A synchronization operation without an associated memory |
| location is a fence and can be either an acquire fence, a release fence or both an acquire and |
| release fence. In addition, there are relaxed atomic operations, which are not synchronization |
| operations, and atomic read-modify-write operations which have special characteristics |
| </p> |
| <p> |
| The enumerated type <span class="type">memory_order</span> specifies the detailed regular (non-atomic) memory |
| synchronization operations as defined in section 5.1.2.4 of the C11 specification and may |
| provide for operation ordering. Its enumeration constants are as follows: |
| </p> |
| <p> |
| </p> |
| <div class="literallayout"> |
| <p> |
| <code class="code"> <code class="constant">memory_order_relaxed</code><br /> |
| <code class="constant">memory_order_acquire</code><br /> |
| <code class="constant">memory_order_release</code><br /> |
| <code class="constant">memory_order_acq_rel</code><br /> |
| <code class="constant">memory_order_seq_cst</code></code> |
| </p> |
| </div> |
| <p> |
| </p> |
| <p> |
| The <span class="type">memory_order</span> can be used when performing |
| atomic operations to global or local memory. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| </div> |
| <div class="refsect1"> |
| <a id="specification"></a> |
| <h2>Specification</h2> |
| <p> |
| <img src="pdficon_small1.gif" /> |
| |
| <a href="https://www.khronos.org/registry/cl/specs/opencl-2.1-openclc.pdf#page=105" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="atomicFunctions.html"><span class="citerefentry"><span class="refentrytitle">Atomic Functions</span></span></a>, |
| <a class="citerefentry" href="memory_scope.html"><span class="citerefentry"><span class="refentrytitle">memory_scope</span></span></a> |
| </p> |
| </div> |
| <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2015 The Khronos Group Inc. |
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